Qtjier



UNITED STATES PATENT OFFICE.

WILLIAM ARROUQUIER AND THOMAS BARRETT, OF WORCESTER, MASS.

MODE OF FORMING HARD-FINISH ON PLASTERING.

SPECIFICATION forming part of Letters Patent No. 228,587, dated June 8, 1880.

Application filed January 12, 1880.

To all whom it may concern:

Be it known that we, WILLIAM ARROU- QUIER and THOMAS BARRETT,both of the city and county of Vorcester, and Commonwealth of Massachusetts, have invented certain new and useful Improvements in the Mode or Process of Forming Hard-Finish on Plastering; and we do hereby declare that the following is a full, clear, and exact description of the same.

To enable those skilled in the art to which our invention belongs to make and use the same, the following detailed description is given:

First, soap-stone is pulverized with alum in the proportion of seven pounds of alum to one hundredpounds of soap-stone; second, one part of slaked lime to two parts of powdered soapstone and alum are mixed together, and a suflicient quantity of water stirred therewith to render the whole of the proper consistency to be spread upon the plastering with a trowel in the ordinary way of applying hard-finish, and the plastic material thus formed is spread upon the face of the plastering and rubbed over it with a trowel or other suitable rubbing or smoothing tool, thereby producing a hard finish upon the plastering of a very perfect and enduring character.

If it is desired to have a very glossy or polished surface, powdered soap-stone may be applied dry or mixed with water, after which the plastering is rubbed over with a trowel or other suitable tool when the soap-stone has been applied in a dry state, and with a brush when applied mixed with water.

As there are many different shades of soapstone, the constructer can give the hard-linish different shades, as desired, by selecting from the different-colored soap-stone; or, if preferred, coloring-matter may be mixed with the pulverized soap-stone, alum, and slaked lime when said ingredients are wet up for use.

By soap-stone in this specification we refer to the soft magnesian mineral technically called talc.

Having described our invention, what we claim as new, and desire to secure by Letters Patent, is-

The mode or process hereinbefore described of forming a hard-finish on plastering, consisting of first powdering and mixing talc or soap-stone with alum in the proportions of about one hundred pounds of the former to about seven pounds of the latter; and, second, mixing said powdered talc or soap-stone and powdered alum with slaked lime in the proportions of two parts of the tale or soap-stone and alum to one part of the slaked lime, and applying the same tothe plastered surface, substantially as described, and for the purposes set forth.

WILLIAM ARROUQUIER. THOMAS BARRETT.

Witnesses:

THOMAS H. Donen, EDWIN E. MOORE. 

